I think so too, the Nij- part anyway, so "new farmer"? Nieuwboer and Nieuweboer are also Dutch surnames.
The Family Names Databank at
www.meertens.knaw.nl describes Nijboer as both occupational and as a habitation name (? adresnaam). So maybe there's a farm somewhere called Nijboer; Nij does occur as a component in place names, and there's a place in Holland called "Boer" so maybe a Nijboer too.